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Our screening of the reaction solvent has been, started with EtOH based on Jørgensen and co-workers studies on the first organocatalytic enantioselective addition of malonates to aromatic α,β-unsaturated aldehydes: S. Brandau, A. Landa, J. Franzén, M. Marigo, K. A. Jørgensen, Angew. Chem. 2006, 118, 4411-4415;
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This is particularly problematic using amine-promoted a-alkylation of aldehydes in the presence of alkylhalides. For an intramolecular a-alkylation of halo-aldehydes, see:
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